drm/msm/hdmi: use devres helper for runtime PM management

Use devm_pm_runtime_enable() to enable runtime PM. This way its effect
will be reverted on device unbind/destruction.

Fixes: 6ed9ed4 ("drm/msm/hdmi: Set up runtime PM for HDMI")
Signed-off-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Abhinav Kumar <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/499647/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

Author: lumag

drivers/gpu/drm/msm/hdmi/hdmi.c

@@ -252,7 +252,7 @@ static struct hdmi *msm_hdmi_init(struct platform_device *pdev)
 	if (hdmi->hpd_gpiod)
 		gpiod_set_consumer_name(hdmi->hpd_gpiod, "HDMI_HPD");
 
-	pm_runtime_enable(&pdev->dev);
+	devm_pm_runtime_enable(&pdev->dev);
 
 	hdmi->workq = alloc_ordered_workqueue("msm_hdmi", 0);